Probing Interactions between Air Bubble and Hydrophobic Polymer Surface: Impact of Solution Salinity and Interfacial Nanobubbles

Cui, Xin; Shi, Chen; Xie, Lei; Liu, Jing; Zeng, Hongbo

doi:10.1021/acs.langmuir.6b01674

Cited by 65 publications

(48 citation statements)

References 60 publications

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“…Now, the only unknown parameter for hydrophobic potential calculation is the decay length. Recent studies have shown that D is system-dependent [8,34,35]. Donaldson et al [36] reviewed the current hydrophobic force experimental results and found that a decay length of 0.3-2 nm in a general exponential decay law is able to describe all the intrinsic hydrophobic forces.…”

Section: Theoretical Modelmentioning

confidence: 99%

Role of Collectors and Depressants in Mineral Flotation: A Theoretical Analysis Based on Extended DLVO Theory

et al. 2017

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A theoretical analysis was conducted to study the role of collectors and depressants in flotation, based on the extended Derjaguin-Landau-Verwey-Overbeek (DLVO) theory, where the hydrophobic force is considered. The collector-coated hydrophilic particle and the depressant-coated hydrophobic particle are simplified to a sphere uniformly covered with respectively hydrophobic and hydrophilic nanometer-sized hemispherical asperities of identical radius. Results show that the role of a collector in bubble-particle attachment is to create an attractive hydrophobic force and thus overcome the repulsive van der Waals and electrostatic forces. Moreover, increasing the length of the hydrophobic part of the collector molecule is a more effective way to enhance flotation recovery, compared to increasing the collector concentration. For a depressant, however, its function mechanism is to create a strong electrostatic double-layer force, while the suppression of the hydrophobic force plays a secondary role in decreasing the bubble-particle attachment barrier. The depressant molecule length is also a dominant parameter in designing a powerful depressant.

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Section: Theoretical Modelmentioning

confidence: 99%

Role of Collectors and Depressants in Mineral Flotation: A Theoretical Analysis Based on Extended DLVO Theory

et al. 2017

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“…The HB interaction between air bubble and OTS‐mica substrate was reported to follow an exponential relation, as described in Equation , where D 0 is the decay length of HB interaction, γ AW is the air/water interfacial tension, and θ c is static the water contact angle on the OTS–mica substrate ,

true \prod_{HB} ([], h ((), r, t)) = - \frac{C_{0}}{D_{0}} prefixexp ((), - \frac{h ((), r, t)}{D_{0}}) = - \frac{γ_{AW} ((), 1 - prefixcos θ_{c})}{D_{0}} prefixexp ((), - \frac{h ((), r, t)}{D_{0}})

…”

Section: Methodsmentioning

confidence: 99%

Probing the Effect of Salinity and pH on Surface Interactions between Air Bubbles and Hydrophobic Solids: Implications for Colloidal Assembly at Air/Water Interfaces

Cui

Shi

Zhang

et al. 2017

Chemistry An Asian Journal

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In this work, a bubble probe atomic force microscope (AFM) was employed to quantify the interactions between two air bubbles and between an air bubble and an octadecyltrichlorosilane (OTS)-hydrophobized mica under various aqueous conditions. The key parameters (e.g., surface potentials, decay length of hydrophobic attraction) were obtained by analyzing the measured forces through a theoretical model based on Reynolds lubrication theory and an augmented Young-Laplace equation by including effect of disjoining pressure. The bubble-OTS hydrophobic attraction with a decay length of 1.0 nm was found to be independent of solution pH and salinity. These parameters were further used to predict the attachment of OTS-hydrophobized particles onto the air/water interface, demonstrating that particle attachment driven by hydrophobic attraction could be facilitated by suppressing electrical double-layer repulsion at low pH or high salinity condition. This facile methodology can be readily extended to quantify interactions of many other colloidal particles with gas/water and oil/water interfaces, with implications for colloidal assembly at different interfaces in many engineering applications.

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“…P Laplace can be obtained by solving the Young–Laplace Equation (Equation )

P_{Laplace} = \frac{2 γ}{R} - \frac{γ}{r} \frac{\partial}{\partial r} (r \frac{\partial h}{\partial r})

where, R is the radius of the bubble and γ is the surface tension of the liquid. The disjoining pressure (surface force per unit area) originates from different surface force components namely Vanderwaals (VdW), electrostatic double layer (EDL) as well as hydrophobic interactions (HB) (Equations –) . For a given solid–liquid–vapor system, Vanderwaals component

\prod_{normalVdW} [h (r, t)] = - \frac{A_{normalH}}{(6 π h^{_{3}} (r, t)}

…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…The interaction between disjoining pressure (surface force per unit area) and Laplace pressure of the bubble determines its adhesive or repulsive behavior in a liquid medium. If the negative disjoining pressure (attractive) overcomes the Laplace pressure, thin liquid film gets destabilized and bubble attachment occurs . The stability of liquid film contributed by the repulsive Vanderwaals force offers little possibility for bubble adhesion.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Recent Progress in Fabricating Superaerophobic and Superaerophilic Surfaces

George

Chidangil

George

2017

Adv Materials Inter

102

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In spite of large amount of research in fabricating surfaces of varying wettability by biomimicking the naturally occurring surfaces, the work on fundamentally and industrially important air bubble adhesion on solid surfaces and its applications are still in the burgeoning stage. The present progress report provides a discussion and a critical evaluation of the recent literature available on the fabrication of superaerophilic/superaerophobic surfaces via synergic modification of surface topography and surface chemistry. An abridge on the physics behind bubble wetting on a solid in a liquid medium is deciphered here, considering the interfacial surface tension balance at the three‐phase contact line, Laplace pressure, hydrostatic pressure, and surface forces, respectively. Emphasis is made on the advancement in micro/nanofabrication technologies to fabricate surfaces that break the conventional wisdom of complementary behavior of water and air bubble contact angles. The progress report presented here also shines light on the mechanism of air bubble dynamics on solid surfaces and the latest developments in achieving surfaces of varied air bubble adhesion and its applications. Finally, the prospects of the superaerophobic and superaerophilic surfaces in the near future together with the challenges faced in accomplishing them are also insinuated.

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Probing Interactions between Air Bubble and Hydrophobic Polymer Surface: Impact of Solution Salinity and Interfacial Nanobubbles

Cited by 65 publications

References 60 publications

Role of Collectors and Depressants in Mineral Flotation: A Theoretical Analysis Based on Extended DLVO Theory

Role of Collectors and Depressants in Mineral Flotation: A Theoretical Analysis Based on Extended DLVO Theory

Probing the Effect of Salinity and pH on Surface Interactions between Air Bubbles and Hydrophobic Solids: Implications for Colloidal Assembly at Air/Water Interfaces

Recent Progress in Fabricating Superaerophobic and Superaerophilic Surfaces

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